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All Journal JOURNAL ONLINE OF PHYSICS JURNAL PENDIDIKAN TAMBUSAI Jurnal Ilmu Fisika Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Pillar of Physics: Jurnal Berkala Ilmiah Fisika Georest: Geoscience, Remote Sensing, and Technology Journal of Multidisciplinary Science: MIKAILALSYS Journal of Climate Change Society
Nofi Yendri Sudiar
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Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences Other

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Analisis Heat Stress Menggunakan Metode Temperature Humidity Index (THI) di Kota Padang Riandini, Annisa; Sudiar, Nofi Yendri; Akmam, Akmam; Zulhendra, Zulhendra
Jurnal Pendidikan Tambusai Vol. 10 No. 1 (2026)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v10i1.36249

Abstract

Penelitian ini memiliki tujuan untuk mengetahui bagaimana tingkat kenyamanan termal di Kota Padang dan bagaimana pengaruh tingkat kenyamanan termal terhadap heat stress di Kota Padang berdasarkan metode Temperature Humidity Index (THI). Data yang digunakan dalam studi ini yaitu curah hujan, suhu udara dan kelembaban udara dari Badan Meteorologi Klimatologi dan Geofisika Teluk Bayur periode 2009-2023. Hasil penelitian menunjukkan bahwa tingkat kenyamanan termal di Kota Padang dengan kategori sebagian nyaman sebesar 91,11% dan kategori tidak nyaman sebesar 6,67%. Kenyamanan termal berpengaruh terhadap heat stress sebagai keseimbangan tubuh dengan lingkungan. Jika kondisi lingkungan masih dalam batas kenyamanan, maka tubuh dapat menjaga suhu tetap stabil melalui mekanisme fisiologis seperti penguapan keringat.
Analysis Of Cape Index And Total Index Thresholds Towards Cumulonimbus Cloud And Thunderstorm Events At Minangkabau International Airport Indah Yoseva Effendi; Nofi Yendri Sudiar; Ratnawulan; Harman Amir
Journal of Climate Change Society Vol. 4 No. 1 (2026)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jccs/Vol4-iss1/83

Abstract

Indonesia located along the equator and dominated by oceanic areas, is highly vulnerable to atmospheric dynamics and extreme convective weather. Minangkabau International Airport (BIM), situated in a coastal region of West Sumatra, is frequently affected by cumulonimbus (Cb) clouds and thunderstorms (TS), which pose risks to aviation safety. This study aims to determine the threshold values of the Convective Available Potential Energy (CAPE) index and the Total Totals Index (TT) that are appropriate for local conditions, based on radiosonde and synoptic observation data from 2019–2023, and verified using 2024 data. The CAPE and TT values were analyzed using Sturges’ method to determine frequency intervals and dichotomous analysis to establish threshold effectiveness. Results indicate that CAPE thresholds for Cb clouds range from 495 to 2679 J/kg, while TT thresholds for thunderstorms range from 43.5 to 47.4, depending on the seasonal variation (DJF, MAM, JJA, SON). These thresholds demonstrated strong performance in identifying convective weather events, thus serving as a useful reference for forecasting and enhancing flight safety at BIM.
PENDUGAAN BIDANG GELINCIR DI JORONG SIPARAYO, NAGARI MALAMPAH, KABUPATEN PASAMAN MENGGUNAKAN METODE GEOLISTRIK 2D KONFIGURASI DIPOLE-DIPOLE Adira, Elsa; Akmam, Akmam; Rifai , Hamdi; Sudiar, Nofi Yendri
JOURNAL ONLINE OF PHYSICS Vol. 11 No. 3 (2026): JOP (Journal Online of Physics) Vol 11 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v11i3.57689

Abstract

Bencana tanah longsor memiliki frekuensi tinggi di Indonesia, salah satunya terjadi di Jorong Siparayo, Nagari Malampah. Deformasi pasca-gempa bumi Pasaman 2022 di wilayah tersebut menyebabkan ketidakstabilan lereng yang memicu terjadinya pergerakan massa tanah melalui bidang gelincir bawah permukaan. Oleh karena itu, penelitian ini bertujuan mengidentifikasi bidang gelincir menggunakan metode geolistrik tahanan jenis konfigurasi dipole-dipole sebanyak 5 lintasan sepanjang 195 meter dengan spasi elektroda 5 meter. Pengolahan data menggunakan bantuan software res2dinv melalui proses inversi least-squares untuk menghasilkan penampang tahanan jenis dua dimensi (2D) sebenarnya. Hasil penelitian menunjukkan nilai tahanan jenis di lokasi penelitian secara keseluruhan berkisar antara 0,0069-17231 . Lapisan tanah penutup terdiri atas lempung jenuh air, aluvium, dan tanah rombakan pasiran dengan nilai tahanan jenis 0,0069-618  pada kedalaman 0 hingga >21 meter. Di bawahnya, terdapat batuan dasar berupa Andesit Masif dengan tahanan jenis tinggi mencapai >17231 . Bidang gelincir teridentifikasi pada batas kontak mekanis antara lapisan penutup gembur yang jenuh air dengan batuan dasar Andesit kompak yang kedap air. Geometri bidang gelincir bervariasi meliputi pola cekungan melandai dengan kedalaman >21 meter hingga pola bergelombang pada segmen lereng atas dengan kemiringan sudut lereng kritis lapangan 31° hingga >42°. Kebaruan penelitian ini terletak pada pemetaan variasi geometri dan batas lapisan bidang gelincir yang dipicu langsung oleh pergeseran tanah pasca-gempa 2022 di area lereng yang curam.
Analysis of the Effects of the Indian Ocean Dipole (IOD) and the Madden-Julian Oscillation (MJO) on Rainfall During the Dry Season in Padang Endar Sabila; Nofi Yendri Sudiar; Hamdi; Letmi Dwiridal
Journal of Multidisciplinary Science: MIKAILALSYS Vol 4 No 3 (2026): Journal of Multidisciplinary Science: MIKAILALSYS
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/mikailalsys.v4i3.11971

Abstract

Dry-season rainfall in Padang is highly variable and can reach extreme intensities; however, the influence of global atmospheric phenomena on rainfall variability during June–August (JJA) remains insufficiently understood. This study examined the relationships of the Madden–Julian Oscillation (MJO) and Indian Ocean Dipole (IOD) with dry-season rainfall variability in Padang. The analysis used daily MJO index data from the Bureau of Meteorology, monthly Dipole Mode Index data from JAMSTEC, and rainfall records from Minangkabau International Airport Station for 1991–2020 and Teluk Bayur Maritime Meteorological Station for 1994–2020. Pearson correlation and cross-correlation analyses were employed to determine the strength, significance, and temporal lag of the relationships between MJO and IOD activity and rainfall. MJO Phase 3 was positively and significantly correlated with JJA rainfall at Minangkabau International Airport Station (r = .254, p = .003) and Teluk Bayur Station (r = .232, p = .006), whereas MJO Phase 4 showed no significant relationship. Cross-correlation analysis identified a significant negative relationship at a lag of approximately 10–12 days, indicating that rainfall tends to decrease 10–12 days after the active MJO passes. By contrast, the negative IOD was not significantly associated with JJA rainfall in either the contemporaneous or lagged analyses. These findings demonstrate that MJO Phase 3 is more closely associated with dry-season rainfall variability in Padang than either MJO Phase 4 or the negative IOD. Monitoring MJO Phase 3 may therefore provide useful supplementary information for medium-range dry-season rainfall forecasting in the region.
Co-Authors Adira, Elsa Akmam Akmam Ari Nuryadi Asrizal Az-Zahra, Khalishah Raudhatul Bahri, Aliefa Zunaida Bana, Vrielsha Endar Sabila Fadhila Ulfa Jhora Gautama, Muhammad Isa Habiburrahman, H Hamdi Hamdi Hamdi Harman Amir Ifdil Ifdil Indah Yoseva Effendi Letmi Dwiridal Madinah, Nur Mairizwan, M Mairizwan, Mairizwan Pakhrur Razi Rahmadhani, Annisa Ratnawulan . Razi, Pakhur Riandini, Annisa Rifai , Hamdi Rinadi, Aulia Rozi, Hanifsyah Thamrin Thamrin Yohandri Bow Yohandri, Y Yulkifli Yulkifli Zulhendra Zulhendra Zulhendra, Zulhendra